Underfeed-stoker.



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PATENTED DEU. 15, 1903.

J. M. SEARLB. UNDERPEED STOKER.

APPLICATION FILED JUNE so, 190s.

No MODEL.

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J. M. SEARLE. UNDERPEED STDKER.

MPLIGATION FILED' JUNE 30.1993.

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Patented '.jecember 15, 1903.

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JOSEPH M. SEARLE, OF PITTSBURG, PENNSYLVANIA.

UNUERFEEDeSTOKER.

SPECIFICATION forming part of Letters Patent No. 747,091, dated December15, V1903. Application led .Tune 30, 1903. Serial No. 163,773. (Nomodel.)

To all whom, t may concern:

Be it known that I, JOSEPH M. SEARLE, a citizen of the United States,and a resident of Pittsburg, Pennsylvania, have invented ce1- tainImprovements in Underfeed-Stokers, of which the following is aspecification.

One object of my invention is to so construct an underfeed-stoker as toprovide simple and effective means for causing the forward feed of thefuel through the trough, and

a further object is to insure a sufficient supbut showing the fueLpusherin the raised,

position; and Figs'. 4, 5, and 6 are views of twyers employed inconnection with the stoker.

1 represents the hopper for containing the fuel, this hopper having atthe lower end a box 2, which communicates, through a neck 3, with thetrough 4, into and through which the fuel is fed, the combustion of thefuel taking place at the open top of this trough and the fuel being fedforwardly and upwardly through the trough, so as to constantly maintaina supply at the combustion-surface- The bottom of the boX 2 is formedbya vibrating pusher 5, hung to a transverse pin or shaft 6, anddisposed at intervals 4along the bottom of the trough are similarvibrating pushers 5,'hung to transverse pins or shafts 6?. When eitherpusher is in its lowermost position, it closes an opening in the bottomof the box or trough, but when raised from this position it imparts aforward and upward impulse to the fuel resting upon it, so that by asuccession of operations the fuel is y fed forwardly through the troughand at the end of thetrough insuring the rise of the fuel at said endbecause of the forward movement imparted to said mass.

Each of the vibrating pushers 5 5a has a segmental web 8, projectingrearwardly from its outer end, and a plate 9, depending from each side,these plates 8 and 9 serving to prevent any escape of fuel through theopenings in the bottom of the box or trough when the vibrating pusher israised above said. bottom.

A rockshaft 10, mounted in suitable bearings at the end of the box 2,has two arms 11 and 12, the arm 11 being connected to the piston-rod ofa power-cylinder13 and the arm 12 being connected by a link 13 to a pin14 on one of the side plates 9 of the vibrating pusher 5.

The pushers 5 5a are connected by means of links 15 so as to provide forthe simultaneous operation of the entire series, and the links 13 and 15may be located at one side only of the pushers or at both sides of thesame, as desired, the use of the links at both sides of the pushersbeing preferred in order to provide for a balanced application of powerthereto.

From the upper edge of the inclined sides and curved end of the trough 4projects a horizontal flange 16, and in said iilange ou each side of thetrough are formed openings 17, preferably beveled for the reception ofthe correspondingly-beveled necks of a series of twyers 18 and 19, theupper ends of which curve inwardly and form outwardly-flaring grates 20for the support of the fuel at the combustion-surface of the trough, theinwardly-projecting upward portion of each twyer forming a beveledshoulder 21, which directs the fuel away from the flaring grate formedby the upper end of the twyer and tends to prevent clogging of saidgrate,which would interfere with the free escape of air therefrom.

Each twyer-pipe is open at the lower end for the free ingress of air,flow of air up- IOO twyers 18 and v19 are dead-plates 22, which abutagainst external flanges 23 on the twyers and form a fuel-supportingsurface outside of the same. Instead of dead-plates, however, gratedsurfaces may be used when it is desired to maintain active combustion ofthe fire outside of the twyers.

The twyers 18 are simple pipes with beveled necks 24 andslightly-enlarged heads forming the gratedtops of the twyers; but thetwyers 19 have right-angled heads 25, each providing a grated top 2O atthe side of the trough and a similar grated top at the end of thetrough, as shown in Figs. 2 and 4.

As each of the parts of my improved stoker is independent of the others,repairs can be readily effected by simply removing the defective partand replacing it by a new one.

Having thus described my invention, I claim and desire to secure byLetters Paten l. The combination in an underfeed-stoker, of thelongitudinal fueltrough with twyers detachably mounted upon said troughand having depending tubes alongside of the trough, substantially asspecified.

2. The combination in an underfeed-stoker, of the longitudinalfuel-trough, with a grated surface at the top of the same, and a shoul-'der below said grated surface for directing the fuel away from thelatter, substantially as specified.

3. The combination in an underfeed-stoker, of the longitudinalfuel-trough with an outwardly-flaring grated surface at the top of thesame and a shoulder below said outwardly-flaring grated surface fordirecting the fuel away from the latter, substantially as specified.

4. The combination in an underfeed-stoker, of the longitudinalfuel-trough having an outwardly -extending flange at the top with twyerseach consisting of a pipe passing through an opening in said flange anddepending alongside of the trough, each twyer having a gratedair-discharge head directed toward the trough, substantially asspecified.

5. The combination in an underfeed-stoker, of the longitudinal.fuel-trough having an outwardly-extending flange at the top with twyerseach consisting of a pipe passing through an opening in said Iiange anddepending alongside of the trough,each twyer having a gratedair-discharge head directed toward the trough and forming anoutwardly-flaring support for the fuel, substantially as speciy fied.

a grated face extending toward the trough, substantially as specified.

7. The combination in an underfeed-stoker, of the longitudinalfuel-trough having an outwardly-extending flange at the top, with twyerseach consisting of a pipe passing through an opening in said flange anddepending alongside of the trough, said twyer having an inwardly-curvedupper end terminating in an outwardly-flaring grated face extendingtoward the trough, substantially as specified.

8. The combination in an underfeed-stoker, of the fuel-trough having anoutwardlyextending flange at the top said flange having openingstherein, with a series of twyers each consisting of a pipe passingthrough one of said openings in said flange and having aninwardly-directed top terminating in a grated face and forming ashoulder at the top of the trough, substantially as specified.

9. The combination in an underfeed-stoker, of the fueltrough having anoutwardly extending flange at the top, said flange having openingstherein with a series of twyers each consisting of a pipe passingthrough one of said openings in said flange and having aninwardly-directed top terminating in an outwardly-flaring grated faceand forming a shoulder at the top of the trough, substantially asspecified.

10. The combination in an underfeedstoker, of the longitudinalfuel-trough having an outwardly-extended flange at the top, said flangehaving openings therein with a series of twyers each consisting of apipe depending alongside of the trough, said pipe having a neck seatedin a corresponding opening in the flange of the trough and having aninwardlydirected and grated air-discharging upper face, substantially asspecified.

11. The combination in an underfeedstoker, of thelongitudinalfuel-trough having an outwardly-extending flange at the top,with a series of twyers seated on said flange, fuel-supporting platesalso seated on said flange outside of the twyers, and flanges on thetwyers contacting with said plates, substantially as specified.

12. The combination stoker, of thelongitudinal fuel-trough having anoutwardly-extending flange at the top, said fiange having openingstherein and twyers each consisting of a pipe passing through one of theopenings in said flange, the twyers at the outer end of the troughhaving heads with portions at an angle one to the other, substantiallyas specified.

IOC

IIO

in an underfeed- In testimony whereof have signed my l name to thisspecification in the presence of two subscribing witnesses.

JOSEPH M. SEARLE. Witnesses:

S. A. HEAPS, WILLIAM A. BALM.

